Congrats on finishing your game!
I love the sprite artwork! Shame you didn't have enough time to make sprites for more because I would have loved to see what you created. Very straightforward design, and mostly well taught so that I was able to figure out everything easily.
I think my biggest hang-up was the level that introduced yellow bullets. You're never explicitly taught you can gauge projectiles, and needing to shrink as they're about to hit you wasn't intuitive. But mostly what made it frustrating was that it wasn't at the start of a level, so experimenting with trial and error meant I had to replay the first section of the stage several times before I figured it out. That mechanic would benefit greatly from being it's own stage alone, either to teach more directly, or provide a less punishing space for the player to experiment and figure it out.
And as charming as your little doot & snap song was, it quickly became very repetitive. But that's really minor!
Cool little jam game. And it's the perfect length. You showcase a handful of mechanics, give the player a chance to play with them and learn more interactions, and then it's done. Excellently paced!
Good job and keep making games!